Add copy app token button in web gui

[PanderMusubi]

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Is your feature request related to a problem? Please describe. To prevent mistakes and offer more easy copying of app tokens or client tokens, a button to copy a token could be added for each token.

Describe the solution you'd like See above.

Describe alternatives you've considered This is common functionality also found in i.e. Firefox.

Additional context The button could be added directly to the right of where the token is shown.